Qiao Yan naturally saw that what Li Shuhua said was not the truth, and she was suspicious in her heart, when Li Shuhua's mobile phone rang. After answering, she said to Qiao Yan, "I'm going to go out of the scene", and turned around to leave.

"Is there another case?" Qiao Yan asked urgently.

Li Shuhua said that the specific situation was not clear, so she left in a hurry.

Qiao Yan clutched the envelope in her hand and stood stunned for a long time, until the text message prompt prompted her back to her senses. It was a text message from Qiao Ran: Sister, my mother just called, saying that she was coming back for the New Year, staying for two months, and she had already booked a plane ticket, and the plane arrived in Haidu at 11 o'clock this Saturday night.

Accidents followed, and Qiao Yan became more and more stunned. It turned out that he would come back in the middle of this year, why did he suddenly come back for the New Year. So what should she do with the trip to the Philippines that she agreed with Yu Chihong, and she can't leave her mother to accompany Yu Chihong?

Wei Chihong had already arrived at the scene of the crime one step ahead of Li Shuhua, which was the residence of Ge Siqian, a professor of molecular biophysics at Haidu University. This morning, Professor Ge, who was reading the newspaper, suddenly fell to the ground and died. This is another sudden death of a scientist after Professor Zhuang Yiqun, and both of them are not only professors at Haidu University, but also in the same Institute of Life Sciences.

Ge Siqian has retired, and it is said that he reads books and newspapers at home every day, grows flowers and raises fish, and lives a leisurely life.

Ge Siqian had a lot of medicine bottles on his desk, Wei Chihong looked at it carefully, in addition to health products such as soft phospholipids, there was also a bottle of antithrombotic drugs, looking at the text on the medicine bottle, it was a drug produced by Ruixin Pharmaceutical Co., Ltd., the medicine bottle was empty, the lid was not tightened, it should have just finished taking medicine. Next to it was an identical, unopened bottle of new medicine. "This is Professor Ge's medicine, right?" He asked Professor Ge's wife.

Mrs. Ge said yes. Professor Ge suffered from a serious heart condition with bradycardia caused by atrioventricular block, and was fitted with a pacemaker. Venous pacemakers have the possibility of thrombosis, so take antithrombotic drugs to prevent thrombosis.

Yu Chihong opened the bottle of medicine, and it was a capsule. He asked Mrs. Ge if she knew the number of capsules.

Mrs. Ge shook her head and said that Professor Ge handled the matter of taking medicine by himself.

"Did he take the same medicine all the time?" Wei Chihong asked again.

"Yes, I have an impression." Mrs. Ge replied in the affirmative.

Mrs. Ge also provided important information that he had been visited by a former student of his, who was working for a foreign-owned pharmaceutical company, before he died. Last night, Professor Ge mentioned that the medicine was almost finished, and he had to call the student to deliver it.

Yu Chihong's heart jumped suddenly. "Is it Ruixin Pharmaceutical Co., Ltd.? What is the student's name? ”

Mrs. Ge said that it was that company, and the student's name was Deng Xiaolong.

Deng Xiaolong went to Haidu University three years ago to study for a doctorate in molecular biophysics, and he was a student of Ge Siqian.

Deng Xiaolong came to the house at 6 o'clock this morning, that is, about three hours ago, Professor Ge used to go out for a walk around 6 o'clock in the morning every day, they made an appointment last night to go for a walk together this morning, Deng Xiaolong accompanied Ge Siqian out for a turn, and then returned home, chatting with him in the study for a while before leaving.

"Did Professor Ge participate in a secret study seven years ago?" Yu Chihong is almost certain that Ge Siqian's death, like Zhuang Yiqun, is related to the secret research seven years ago, and the two of them, like Xiaoxuan and George, are members of the AC6 project that Hai Haoyi said.

But Mrs. Ge was not aware of the secret research and could not confirm his suspicions.

The result of Li Shuhua's autopsy was that, like Zhuang Yiqun before, he died of aconitine poisoning.

Wei Chihong went to Ruixin Pharmaceutical Co., Ltd. and asked to see Deng Xiaolong by name. The front desk lady took him to the reception room.

"I heard that a police officer was looking for me, and it turned out to be Officer Wei Chi. I don't know what you're doing this time, is it about the death of Professor Zhuang Yiqun, what have you found? Deng Xiaolong walked in leisurely. He still wears black-rimmed glasses, has a mustache, and has a casual expression.

"I'm here today for something else." Wei Chihong's gaze shot straight at him, "Professor Ge Siqian, do you know each other?" ”

"Of course I know Professor Ge, he was my supervisor when I was a Ph.D." Deng Xiaolong replied casually.

"Professor Ge's body was found this morning." Wei Chihong stared at Deng Xiaolong closely, his face was surprisingly calm, "Two scientists died in a row, and you have appeared at both crime scenes." ”

"So you doubt me?" Deng Xiaolong's face did not change.

Yu Chihong looked at him deeply. "It can't be said that there are no doubts."

Deng Xiaolong grinned. "Then tell me, how did he die?"

"Like Zhuang Yiqun, aconitine poisoning." Wei Chihong replied coldly.

"Aconitine, it seems to be a poison that will attack in a few minutes." Deng Xiaolong is still that leisurely appearance.

Wei Chihong said in a deep voice, "Yes."

The corners of Deng Xiaolong's lips hooked up a sinister smile. "Then it doesn't make sense to suspect me, right?"

"Indeed, if you let him eat poison, it will not match the time of death. But if it's just poisoning, it's not impossible. Wei Chihong took out the bottle of antithrombotic medicine from Ge Siqian's desk from his briefcase, "This is your company's product, right?" ”

"That's right, this is a drug produced by our company, and I have always provided it to Professor Ge." Deng Xiaolong maintained his uncomfortable smile.

Yu Chihong shook the medicine bottle in his hand. "I looked at the capsule, and I could have mixed the aconitine toxin into the exact same capsule. This medicine is taken 3 times a day with 1 capsule with 3 meals. You know the total number of capsules and the number you need to take every day, and you have calculated that Professor Ge has the last capsule left today, and he has prepared in advance. Sure enough, Professor Ge called you last night and told you that the medicine was almost finished. So you bring a new bottle of medicine to your door early this morning, and then take advantage of his lack of attention, swap the last capsule in the old bottle and leave. After he took the medicine at breakfast, he was poisoned and died. ”

"Then tell me how Professor Zhuang Yiqun died." Deng Xiaolong raised his eyebrows, looking provocative.

"That day, Professor Zhuang Yiqun drank the nutrient solution you gave him, but it was nearly 1 o'clock at noon, and the time of Professor Zhuang's death was at 14:23." Yu Chihong glanced at Deng Xiaolong, and the other party was smiling mockingly at him, laughing at the fact that the time of death he said did not match at all, "But that doesn't prove that you didn't do it." Tetrodotoxin was found in Professor Zhuang's blood. Taking two poisons at the same time, the poison and the poison compete with each other, which can temporarily inhibit the toxicity, and the concentration of the poison in the blood of the puffer fish reaches half, and the time required is shorter than that of aconitine, so a time interval can be created before the onset of toxicity. ”

The latter words successfully shattered the sarcastic smile on Deng Xiaolong's face. But his face froze for a very short time, and then he smiled and applauded again. "It's exciting, Officer Wei Chi can go write a mystery novel. But unfortunately, this is just your guess, how can it be convincing? ”

"I'll definitely find proof." Wei Chihong said calmly, "I hope that the next time I come, you won't hide and dare not see me." ”

"I'm always looking forward to coming." Deng Xiaolong is also calm and calm.

The two men looked at each other, and there was a surging dark tide in their calm eyes.

Wei Chihong traveled all day and returned home late at night.

Qiao Yan had fallen asleep on the sofa, and the sound of the door lock waking her up.

After Yu Chihong entered the house, he saw that there was only one floor lamp lit in the room, the light was not very bright, and under the light blue lampshade, a room of quiet soft light was radiated. Qiao Yan sat under the lamp, her long hair draped over her shoulders, and her quiet, dream-like face was shrouded in a ghostly light. The eyes were hazy and blurry, gentle as a dream, and bright as a star. He slowly approached her, stood in front of her, and stared at her. "Why haven't you slept so late?"

"You didn't come back, I couldn't sleep." She met him, and he could see himself in her pupils. Her fingers, unconsciously flicking a stack of photos in her hand.

Yu Chihong sat down beside Qiao Yan, his hand covered and pressed on the busy little hand. "What are you looking at?"

Qiao Yan lowered her head and pressed her cheek against the back of his hand. "Before I went to work this morning, someone slipped an envelope with these photos through the crack in our office door. I'm going to look for you in the morning, you're not in the office. ”

Yu Chihong gently pulled out the stack of photos from Qiao Yan's hand, and when he saw the photos, his face immediately changed. He looked through them one by one, and his face became more and more ugly.

"Someone is stalking you." Qiao Yan looked at him worriedly, "You still gave me the photo, I don't know what the purpose is, is it trying to provoke our relationship?" ”

Yu Chihong flipped his hand, held her chin, and held her face up. "Why don't you doubt that Ling Lingyao and I really have something?"

"If I didn't even have the slightest trust in you, I wouldn't be worthy of being your girlfriend." Qiao Yan looked at him, her eyes warm and flickering.

Wei Chihong felt that he was melted and devoured. "Qiao Yan!" He whispered, "Thank you." ”

Qiao Yan looked at him for a moment. "No thanks, but should you tell me the story behind these photos?"

Wei Chihong stretched out his hand and took her into his arms, and told her what happened last night, from his arrival at Zhang Tianbao's house, his conversation with Zhang Tianbao, to his encounter with Ling Lingyao on the beach.

Qiao Yan listened intently, looking up at him from time to time, her eyes were as clear as the morning star before dawn.